Add closeBraceTokenFor and use it instead of BeginToken.

pkg/compiler/lib/src/parser/element_listener.dart

Index: pkg/compiler/lib/src/parser/element_listener.dart
diff --git a/pkg/compiler/lib/src/parser/element_listener.dart b/pkg/compiler/lib/src/parser/element_listener.dart
index 0210d9388fc610b93d3679da90eae0465d374eb2..964d1dba7fb912c45d0e0e3afe7bdc8ad945fa67 100644
--- a/pkg/compiler/lib/src/parser/element_listener.dart
+++ b/pkg/compiler/lib/src/parser/element_listener.dart
@@ -35,8 +35,7 @@ import 'package:front_end/src/fasta/parser.dart'
     show Listener, ParserError, optional;
 import 'package:front_end/src/fasta/parser/identifier_context.dart'
     show IdentifierContext;
-import 'package:front_end/src/scanner/token.dart'
-    show BeginToken, KeywordToken, TokenType;
+import 'package:front_end/src/scanner/token.dart' show KeywordToken, TokenType;
 import 'partial_elements.dart'
     show
         PartialClassElement,
@@ -486,7 +485,7 @@ class ElementListener extends Listener {
   }
 
   @override
-  void handleParenthesizedExpression(BeginToken token) {
+  void handleParenthesizedExpression(Token token) {
     Expression expression = popNode();
     pushNode(new ParenthesizedExpression(expression, token));
   }